Mitsui Chemicals, Inc.

Akinori Takehara

Hiroki Ebata

Takayuki Watanabe

Yoshiharu Kikuchi

Kotaro Ichino

Takashi Hakuta

Shoji Obuchi

Yasuhiro Kitahara

Takayuki Kuroki

Mitsunao Arino

Yuji Noguchi

Takayuki Kajihara

Kazuyoshi Kaneko

Shuichi Nonaka

Masao Kunizane

Satoshi Hase

The present invention provides a rubber composition having adequate foamability, uses thereof, a copolymer contained in the rubber composition, a rubber composition capable of providing a cross-linked foam, which has a low specific gravity and an excellent shape-retaining property even when the usage of a nonconjugated polyene is reduced, and a cross-linked rubber and a cross-linked foam, which are produced from the rubber composition. A copolymer (A) according to the present invention is a copolymer including structural units derived from ethylene [A], an &#x3b1;-olefin [B], a nonconjugated polyene [C-1], in which one carbon-carbon double bond (C&#x2550;C) polymerizable with a metallocene catalyst is present in one molecule, and a nonconjugated polyene [C-2], in which two bonds of C&#x2550;C polymerizable with the metallocene catalyst are present in one molecule, and being synthesized with the metallocene catalyst, wherein (1) the units derived from the component [B] constitute 10 to 50 percent by mole, (2) the total of the units derived from the component [C-1] and the units derived from the component [C-2] is 1.0 to 6.0 percent by mole, (3) the molar ratio of the units derived from the component [C-1] to the units derived from the component [C-2] is 75/25 to 99.5/0.5, (4) [ML (1+4) 100&#xb0; C.] is 10 to 200, and (5) 50&#x3e;activation energy of fluidization (kJ/mol)&#x3e;35 is satisfied.

Copolymer, rubber composition, cross-linked rubber, cross-linked foam, and uses thereof

The present invention provides a molded product exhibiting excellent various properties by improving compatibility of an ethylene/&#x3b1;-olefin/non-conjugated polyene copolymer with a polyolefin resin and a rubber composition for forming the molded product. The present invention further provides a molded product which comprises a rubber composition, is inhibited from fogging and tackiness and is excellent in mechanical strength and heat aging resistance. The rubber composition of the invention comprises an ethylene/&#x3b1;-olefin/non-conjugated polyene copolymer (A), and a polyolefin resin (B) having Mn of not less than 10,000 and/or an ethylene/&#x3b1;-olefin copolymer (C) having Mn of 2500 to 5000, and satisfies the following requirements: (1) a maximum value and a minimum value of an ethylene distribution parameter P of the component (A) have a relationship of Pmax/Pmin&#x2266;1.4, and (2) the B value of the component (C) ([EX]/(2[E]&#xd7;[X])) ([E] and [X] are molar fractions of ethylene and the &#x3b1;-olefin of 3 to 20 carbon atoms, respectively, and [EX] is a fraction of dyad sequence of ethylene/&#x3b1;-olefin of 3 to 20 carbon atoms) is not more than 1.05.

Rubber composition, crosslinked product and foam thereof, molded product therefrom, and use thereof

The invention provides an aliphatic polyester resin composition that contains 100 parts by weight of an aliphatic polyester resin and from 10 to 60 parts by weight of at least one compound of a formula (1):

Aliphatic polyester resin composition and films containing the same

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Chiba, Japan

Akinori Takehara